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  • A Wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistances P an

A Wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistances P and Q:

Option: 1

should be approximately equal and are small


Option: 2

should be very large and unequal


Option: 3

do not play any significant role


Option: 4

should be approximately equal to 2X


Answers (1)

best_answer

In Wheatstone bridge for the balanced condition

\mathrm{\frac{P}{Q}=\frac{X}{Y} } \\

\mathrm{P =\frac{X Q}{Y}} \\

\mathrm{Q =\frac{Y P}{X}}

If \mathrm{P\&\;Q} are equal, then by balancing conditions for  \mathrm{X\&\;Y} will be equal which is a possible case.

The correct option is 1

Posted by

Ritika Kankaria

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